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RELATED PARTIES (Details) $ in Millions	1 Months Ended	12 Months Ended
RELATED PARTIES (Details) $ in Millions	Jun. 30, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2017 plan
Related parties
Payments for assets received from Affiliates			$ 30.0	$ 10.1
Proceeds from assets transferred to related party		$ 0.0	0.0	157.8
ATC
Related parties
Charges to equity method investee for services, construction, and/or operations		11.0	7.9	6.2
Billings from related party for services, pass through costs and other items		107.8	106.1	107.8
Refund from ATC related to a FERC audit		0.0	6.6	0.0
Refund from ATC per FERC ROE order		0.0	0.0	8.9
WRPC
Related parties
Charges to equity method investee for services, construction, and/or operations		0.8	1.2	0.9
Billings from related party for services, pass through costs and other items		2.5	2.4	2.2
Rental payments to WRPC		1.9	1.3	1.3
Purchases of energy from WRPC		0.0	0.0	0.5
WE
Related parties
Charges to equity method investee for services, construction, and/or operations		9.3	10.9	4.5
Billings from related party for services, pass through costs and other items		13.2	17.8	28.2
WBS
Related parties
Charges to equity method investee for services, construction, and/or operations		32.5	17.0	174.9
Billings from related party for services, pass through costs and other items		87.0	111.0	132.9
Proceeds from assets transferred to related party				157.8
UMERC
Related parties
Charges to equity method investee for services, construction, and/or operations		4.2	2.9	0.0
Bluewater
Related parties
Billings from related party for services, pass through costs and other items		11.2	4.7	0.3
Purchases of energy from WRPC		1.1	0.0	0.0
Acquisition of Bluewater	$ 226.0
Natural gas \| WE
Related parties
Sales to related party		2.0	1.9	1.6
Natural gas \| UMERC
Related parties
Sales to related party		2.8	2.7	2.5
Electric \| UMERC
Related parties
Sales to related party		$ 4.5	$ 15.8	$ 16.2
Pension Plan \| Integrys Energy Group Retirement Plan Split
Related parties
Number of separate pension plans created from split \| plan					6